Application of the most popular gravure printing i

2022-08-16
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Application of gravure printing ink on plastic upholstery

gravure printing ink refers to the ink used when gravure printing machines print various substrates. It is also divided into paper gravure printing ink and plastic gravure printing ink. In plastic gravure printing inks, there are surface gravure printing inks and internal composite printing inks

plastic intaglio inks are generally used for printing PE, PP, OPP, NY and other plastic films, but they can also be used for printing composite flexible packaging. As long as there is no large color block on the printing page that has been tested by rewinding cold air, the composite smell and fastness are basically OK. Plastic gravure surface printing ink is mainly made of binder, polyamide resin, pigment and additives after grinding and filtration. The softening point of polyamide resin is controlled at 121 degrees, otherwise printing adhesion will occur during printing in the rainy season due to low softening point of resin. The resin with high softening point will freeze in winter, so it needs to be heated and mixed to make it melt. The diluting solvents of plastic gravure surface printing ink are toluene, isopropanol, xylene, butanol, etc. Some ester solvents can also be added in time to adjust the viscosity of the ink. Toluene and isopropanol are fast drying solvents. Xylene and butanol are slow drying solvents. When using butanol, it should be noted that if the ink dries too fast, resulting in the loss of graphic points, the appropriate addition is verified by special tools and standard Newton weights, so as to ensure that the transmission accuracy of this experimental machine and friction torque is accurate and reliable according to the provisions of the measurement method. Butanol makes the ink reproducible, and the small characters and dots are clear, but adding more will cause the ink not to dry, especially in the rainy season, there will be print adhesion and anti adhesion

plastic intaglio printing ink, also known as composite ink, refers to the ink printed in the substrate. The binder of this ink is mainly chlorinated polypropylene resin, which has high adhesion to printing OPP, pet, NY and other thin films. After compounding, the black ink is clamped in the inner layer, which is the ink for printing high-grade plastic soft bags. The main solvents used for dilution are toluene, acetophenone, butanone and ethyl acetate. Methyl ethyl ketone, toluene and ethyl acetate are fast drying solvents, while butanone is slow drying solvent. Alcohol solvents should not be added to this kind of ink, otherwise the ink will deteriorate. Pay attention when using plastic gravure composite ink, because ink manufacturers have the difference between high-speed machine fast drying ink and low-speed machine drying ink when designing ink. When printing, the choice of ink should be determined by the rotation speed of the gravure press. Otherwise, the rotation speed of the gravure press is slow and the ink dries in the pits of the gravure points; Gravure printing machine speed fast printing and can't dry

for steaming resistant plastic flexible packaging or printing aluminum foil, we should choose steaming resistant two-component gravure ink and special ink for aluminum foil. Otherwise, it will not be able to resist cooking, and the ink in the inner layer of the composite will become thin, discolored, and the graphics and texts are not clear after cooking. In the production of cooking resistant packaging bags, we also need to choose high temperature resistant materials and cooking resistant two-component composite glue

the surface tension of plastic intaglio printing ink is generally 36 dynes, while the surface tension of PE and OPP is generally only about 32 dynes, which requires that during intaglio printing, the film should be corona treated to destroy the molecular structure of the plastic surface, improve the surface tension of the film to more than 38 dynes, make the ink and the film affinity and stick firmly, and the ink cannot be torn off by hand rubbing and adhesive tape, so as to meet the printing quality requirements

due to the influence of chlorinated polymer on the ozone layer in the production of plastic gravure printing ink, toluene is widely used in gravure printing to dissolve and adjust the viscosity of the ink, which is harmful to the health and safety of workers. This requires the ink manufacturer to develop low toxicity, non-toxic alcohol soluble and water-soluble Gravure plastic printing ink as soon as possible. In the production of paper plastic composite coiled materials (for users to pack drugs, tea bags, etc.) and liquid packaging film coiled materials, we have adopted plastic flexo, and now we have successfully achieved small-scale mass production of ink. This ink is alcohol soluble, and the added solvents are alcohols and esters. It has low toxicity and meets the hygienic requirements of tasteless and benzene free

in a word, the selection and application of plastic gravure printing ink should be based on many factors such as the performance of different gravure printing machines and the proficiency of operators. You need to know what material to print on, how fast the gravure press is, how dry the ink is, whether the printing color is consistent with the original, whether the post press processing meets the requirements and the purpose of the final product. Different inks should be selected for different specifications and different plastic flexible packaging bags (films). Only by choosing the right ink and materials, combined with careful operation, can we produce exquisite plastic printing products

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